From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Lord Subject: Re: libata pm Date: Fri, 01 Feb 2008 09:06:01 -0500 Message-ID: <47A32749.6060009@rtr.ca> References: <52279.82.140.50.2.1201370600.squirrel@ssl.cavemail.org> <49398.82.140.50.2.1201377943.squirrel@ssl.cavemail.org> <479BC34D.2000007@gmail.com> <49407.82.140.63.93.1201397926.squirrel@ssl.cavemail.org> <49713.82.140.63.93.1201462475.squirrel@ssl.cavemail.org> <479D2D3C.4050102@gmail.com> <51861.82.140.47.248.1201516318.squirrel@ssl.cavemail.org> <479DC4A4.30809@gmail.com> <50028.82.140.53.128.1201728857.squirrel@ssl.cavemail.org> <47A120D4.7030504@gmail.com> <59194.82.140.47.129.1201873378.squirrel@ssl.cavemail.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from rtr.ca ([76.10.145.34]:3730 "EHLO mail.rtr.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750738AbYBAOGF (ORCPT ); Fri, 1 Feb 2008 09:06:05 -0500 In-Reply-To: <59194.82.140.47.129.1201873378.squirrel@ssl.cavemail.org> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: dusty@gmx.li Cc: Tejun Heo , linux-ide@vger.kernel.org dusty@gmx.li wrote: >>> Sorry for my late answer, but i had to sort this out first. >>> After replacing the first PSU with a new Corsair 650W the power no >>> longer fluctuated more than 0,01 V (and this only when booting up the >>> drives...) I did a full resync on both raid arrays and got no more >>> errors or resets, but there were some inconsitencies during sync and the >>> xfs filesystem on both arrays had to be repaired. Are these problems >>> caused by the pm resets ? >>> >> libata EH won't lose any data as long as the hardware doesn't. If power >> fluctuates causing your drive to briefly power down - this does happen and >> you can hear the drive doing emergency unload when it happens, the data in >> write buffer can be lost. On coming back, all that libata can know is >> that the PHY suffered brief connection loss, so it resets the device and >> goes on, so the data in the cache is lost now. It's basically pulling the >> power plug from the harddrive while write is going on and connecting it >> back quickly. You're bound to lose data. >> > After I got the new PSU and the raid was in full sync without any error > for 48h, I thought all problems were gone. Today the sata errors > reappeared and whenever the load is high enough I get the following: .. What exact brand/model drives are those again (hdparm --Istdout, please) ? If I have a similar unit here, I may try to reproduce this. Cheers